Photovoltaic junction box and welding spot detection equipment

Abstract

The utility model provides a photovoltaic junction box and welding spot detection equipment, relates to the field of photovoltaic technology, and aims to solve the technical problem that two polar plates of the photovoltaic junction box are easy to be short-circuited due to conductive liquid. The photovoltaic junction box comprises a box body, a diode and two polar plates connected to the diode, wherein the diode and the two polar plates are positioned in the box body; the polar plates and the bus bars entering the box body are welded to form welding spots, a cavity of the box body forms two independent containing spaces through a blocking structure, and the two polar plates are located in the two containing spaces respectively. And the blocking structure is used for blocking an ultrasonic propagation medium from flowing between the two accommodating spaces when the welding spot is detected by utilizing ultrasonic waves. The photovoltaic junction box provided by the utility model can reduce the risk of diode short circuit caused by ultrasonic propagation media.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic junction box and welding point detection equipment. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] During the production of photovoltaic modules, the photovoltaic junction box is installed on the back of the photovoltaic module through busbar welding, wherein the busbar is welded to the plate leading out of the diode in the photovoltaic junction box. In the process of detecting the welding point using ultrasonic technology, an ultrasonic propagation medium is required to realize the propagation of ultrasonic waves, and the ultrasonic propagation medium is generally a conductive liquid, which may cause a path to form between the two plates. When the photovoltaic junction box needs to work, the diode is easily short-circuited by it and loses its bypass function, thus affecting the safety of the photovoltaic module. Utility Model Content

[0004] The utility model aims to provide a photovoltaic junction box and a welding point detection device to solve the technical problem that the two pole plates of the photovoltaic junction box are prone to short circuit due to conductive liquid.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a photovoltaic junction box, comprising a box body, a diode, and two pole plates connected to the diode, wherein the diode and the two pole plates are located in the box body, and the pole plates and the bus bars entering the box body are welded to form welding points;

[0007] The cavity of the box body forms two independent accommodating spaces through a barrier structure, and the two electrode plates are respectively located in the two accommodating spaces, and the barrier structure is used to block the ultrasonic propagation medium from flowing between the two accommodating spaces when the welding point is detected by ultrasonic wave;

[0008] According to at least one embodiment of the present utility model, the barrier structure comprises a barrier plate disposed in the box body, the barrier plate extending from one side wall of the box body to the other opposite side wall to form the barrier structure, or,

[0009] The blocking plate cooperates with at least a portion of the diode to form the blocking structure.

[0010] According to at least one embodiment of the present invention, there is a first distance between the top surface of the blocking plate and the bottom wall of the cavity, there is a second distance between the top surface of the electrode plate and the bottom wall of the cavity, and the first distance is greater than the second distance.

[0011] According to at least one embodiment of the present utility model, each of the electrode plates is arranged with a first welding hole and a second welding hole along a direction away from the diode;

[0012] The bottom wall of the box body is provided with two first through holes opposite to the first welding holes and two second through holes opposite to the second welding holes;

[0013] The first through hole and the first welding hole are used for the bus bar to enter the box body; or, the second through hole and the second welding hole are used for the bus bar to enter the box body.

[0014] According to at least one embodiment of the present utility model, the blocking plate and the box body are an integrally formed structure.

[0015] In a second aspect, the utility model provides a welding point detection device, wherein the welding point is a welding point where a plate of a photovoltaic junction box is connected to a bus bar, and the detection device comprises an ultrasonic detection part, a dripping part, a slide rail, and a base part slidably arranged on the slide rail;

[0016] The dripping part includes at least one dripping tube, one end of the at least one dripping tube is connected to the base part, and the other end is used to drip the ultrasonic propagation medium into the welding point;

[0017] The ultrasonic detection part includes at least one ultrasonic probe and at least one first linear motion mechanism. The fixed end of the at least one first linear motion mechanism is arranged on the base part, and each of the ultrasonic probes is arranged on the first telescopic end of the corresponding first linear motion mechanism.

[0018] According to at least one embodiment of the present utility model, the dripping part further includes a pushing mechanism, and the pushing mechanism is used to provide the ultrasonic propagation medium to the dripping tube.

[0019] According to at least one embodiment of the utility model, the pushing mechanism includes a cylinder, a second linear motion mechanism and a piston adapted to the cylinder, the piston is connected to the second telescopic end of the second linear motion mechanism, and the end of the cylinder away from the second linear motion mechanism is connected to the at least one drip tube; or,

[0020] The pushing mechanism comprises a barrel and a metering pump, and the barrel is connected to the drip tube through the metering pump;

[0021] The cylinder is used to contain the ultrasonic propagation medium.

[0022] According to at least one embodiment of the present utility model, the first linear motion mechanism and / or the second linear motion mechanism respectively include one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0023] According to at least one embodiment of the present utility model, the number of the ultrasonic probes is two, and the two ultrasonic probes are spaced apart and distributed along a preset direction; and / or,

[0024] The number of the drip tubes is two, and the two drip tubes are spaced apart and distributed along a preset direction;

[0025] The preset direction refers to: the extending direction of the slide rail.

[0026] According to at least one embodiment of the present utility model, the detection device further comprises a blowing part for clearing the ultrasonic propagation medium on the welding point, and the air outlet of the blowing part faces the welding point.

[0027] According to at least one embodiment of the present utility model, the detection device further includes a conveying mechanism, and the conveying mechanism is used to convey the photovoltaic junction box.

[0028] According to at least one embodiment of the present utility model, the detection device further comprises a casing, a first opening for the photovoltaic junction box to pass through is formed in a portion of the casing close to the rear end of the conveying mechanism, and the blowing part is disposed at the first opening.

[0029] According to at least one embodiment of the utility model, the detection equipment also includes two position sensing devices which are communicatively connected to the conveying mechanism via a controller, a second opening for the photovoltaic junction box to pass through is provided at a portion of the casing close to the head end of the conveying mechanism, and one of the two position sensing devices is arranged at the first opening, and the other is arranged at the second opening.

[0030] Among the one or more technical solutions provided in the exemplary embodiments of the present utility model, at least one of the following beneficial effects can be achieved.

[0031] The photovoltaic junction box of the exemplary embodiment of the utility model includes a box body, a diode and two pole plates connected to the diode. The cavity of the box body is divided into two independent accommodating spaces by a barrier structure, so that the two accommodating spaces are isolated from each other, so that the conductive solution on one pole plate will not form a passage with the other pole plate, thereby avoiding a short circuit of the diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description thereof, wherein these drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification;

[0033] Figure 1 It is a schematic diagram of the axonometric structure of the detection device according to the embodiment of the utility model;

[0034] Figure 2 It is a structural schematic diagram of a base portion according to an embodiment of the utility model;

[0035] Figure 3 It is a schematic structural diagram of a drip tube and an ultrasonic detection unit according to an embodiment of the utility model;

[0036] Figure 4 It is a structural schematic diagram of a pushing mechanism according to an embodiment of the utility model;

[0037] Figure 5 It is a schematic diagram of the structure of a photovoltaic junction box and an ultrasonic probe according to an embodiment of the utility model;

[0038] Figure 6 It is a structural schematic diagram of a blowing part according to an embodiment of the utility model;

[0039] Figure 7 It is a schematic diagram of the axonometric structure of a photovoltaic junction box according to an embodiment of the utility model;

[0040] Figure 8 It is a schematic diagram of the axonometric structure of the photovoltaic junction box according to an embodiment of the utility model from another viewing angle.

[0041] Figure numerals: 11, ultrasonic probe; 12, arm; 13, first linear motion mechanism; 131, fixed end; 132, first telescopic end; 21, drip tube; 22, cylinder; 23, piston; 24, second linear motion mechanism; 241, fixed part; 242, second telescopic end; 30, photovoltaic junction box; 31, welding point; 311, first welding hole; 312, second welding hole; 33, diode; 34, plate; 35, blocking plate; 361, first through hole; 362, second through hole; 41, first opening; 42, second opening; 43, position sensing device; 50, slide rail; 51, base; 60, conveying mechanism; 70, blowing part. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The photovoltaic junction box is set on the back of the photovoltaic module through the busbar welding. For example, the two plates of the bypass diode of the photovoltaic junction box are respectively welded to the busbar to form a welding point. In the related art, the welding effect of the welding point is detected by ultrasonic non-destructive testing. This detection method requires adding an ultrasonic propagation medium to the welding point. The ultrasonic propagation medium is generally a conductive liquid. The conductive liquid will flow along the busbar and form a path with the other plate. When the photovoltaic junction box needs to work, the diode is easily short-circuited by it and loses the bypass function, thereby affecting the safety of the photovoltaic module.

[0044] In view of the above problems, the photovoltaic junction box provided by the exemplary embodiment of the present invention blocks the passage between two plates of different polarities due to the conductive liquid by setting a barrier structure between the two plates. Figure 5 As shown, Figure 5 It is a schematic diagram of the structure of a photovoltaic junction box and an ultrasonic probe according to an embodiment of the utility model. The welding point 31 is a welding point or solder layer where the plate 34 of the photovoltaic junction box 30 is connected to the bus bar. There are two plates 34 in the photovoltaic junction box 30, which are respectively connected to the two sides of the bypass diode 33. Each plate 34 forms a welding point 31 with the corresponding bus bar. When ultrasonic testing is performed, it is necessary to coat the ultrasonic propagation medium at the position of the two welding points 31, which easily leads to the formation of a path between the two plates 34.

[0045] Figure 7 It is a schematic diagram of the axonometric structure of a photovoltaic junction box according to an embodiment of the utility model; Figure 8 FIG. 2 is a schematic diagram of the axonometric structure of a photovoltaic junction box according to an embodiment of the present utility model from another perspective. Figure 7 and Figure 8 As shown, the cavity of the box body of the photovoltaic junction box 30 forms two independent accommodating spaces through a barrier structure, and the two pole plates 34 are respectively located in the two accommodating spaces. The barrier structure is used to block the passage of the conductive liquid.

[0046] Exemplarily, the barrier structure includes a barrier plate 35 disposed in the box body, the barrier plate extending from one side wall of the box body to the other opposite side wall to form the barrier structure. For another example, the barrier plate 35 cooperates with at least part of the diode 33 to form the barrier structure.

[0047] Exemplarily, the blocking plate 35 is a straight plate-like structure or a bent plate-like structure, which is arranged between the two plates 34 and extends from one side wall to the other opposite side wall of the box body. Since the diode 33 is also arranged between the two plates 34, a through hole can be arranged on the blocking plate 35 for the connection line between the diode 33 and the plate 34 to pass through. At this time, the blocking plate 35 extends from one side wall to the other opposite side wall, and then bends along the axial direction of the diode 33 and continues to extend from one end of the diode 33 to the other opposite side wall until it is connected to the other side wall; or, the blocking plate 35 is a straight plate-like structure, and a card slot matching the outer contour of part of the diode 33 is arranged on the blocking plate 35, so that part of the diode 33 can be carded on the blocking plate 35. That is, the blocking plate 35 and part of the diode 33 together form a barrier structure, which separates the two plates 34 in two independent accommodating spaces to prevent the ultrasonic propagation medium from generating a passage in the box body. Exemplarily, except for the top surface, the two side surfaces and the bottom surface of the blocking plate 35 are all connected to the box body. Further, when a card slot is provided on the blocking plate 35, the blocking plate 35 can also fix the position of the diode 33 to facilitate the installation of the diode 33 in the box body.

[0048] like Figure 7 As shown, there is a first distance between the top surface of the blocking plate 35 and the bottom wall of the cavity, and there is a second distance between the top surface of the electrode plate 34 and the bottom wall of the cavity, and the first distance is greater than the second distance. That is, the height of the blocking plate 35 is higher than the height of the electrode plate 34, and when there is residual ultrasonic propagation medium on the welding point 31, it can prevent the ultrasonic propagation medium on the two welding points 31 from sputtering to each other to form a path.

[0049] Exemplarily, the blocking plate 35 and the box body are an integrally formed structure. This embodiment has a simple production process and low cost.

[0050] In related technologies, such as Figure 5 and Figure 7 As shown, two bus bars penetrate from the bottom wall of the box body respectively and form welding points 31 at the positions of the first welding holes 311 of the two plates 34. The two welding points 31 are relatively close to the diode 33, that is, the two welding points 31 are close to each other. When performing ultrasonic testing, the ultrasonic propagation medium can easily cause a short circuit between the two plates.

[0051] like Figure 7 and Figure 8As shown, in the photovoltaic junction box 30 provided by the exemplary embodiment of the utility model, each pole plate 34 is arranged with a first welding hole 311 and a second welding hole 312 along the direction away from the diode 33; the bottom wall of the box body is provided with two first perforations 361 opposite to the first welding hole 311 and two second perforations 362 opposite to the second welding holes 312, wherein the first perforations 361 and the first welding holes 311 can be used in combination for the bus bar to enter the box body of the junction box; or, the second perforations 362 and the second welding holes 312 are also used for the bus bar to enter the box body of the junction box.

[0052] In actual use, depending on the different types of photovoltaic modules, the two busbars can respectively pass through the first through-hole 361 to form a welding spot 31 at the corresponding first welding hole 311, or can respectively pass through the second through-hole 362 to form a welding spot 31 at the corresponding second welding hole 312. Based on this, when the photovoltaic junction box can use two busbars to form a welding spot 31 at the second welding hole 312, the length of the busbar can be reduced compared to forming a welding spot 31 at the first welding hole 311, saving the amount of busbar used, and the welding spots 31 formed at the two second welding holes 312 are farther apart, making it less likely that a short circuit will occur due to the use of an ultrasonic propagation medium.

[0053] Furthermore, since the photovoltaic junction box generates a large amount of heat during operation, when the weld spot 31 is formed at the two first weld holes 311, the second weld hole 312 and the second through-hole 362 can play a role in heat dissipation due to the absence of a bus bar; similarly, when the weld spot 31 is formed at the two second weld holes 312, the first weld hole 311 and the first through-hole 361 can play a role in heat dissipation due to the absence of a bus bar.

[0054] The exemplary embodiment of the utility model also provides a welding spot detection device, which uses ultrasonic waves to detect the welding effect of welding spots. The working principle of ultrasonic welding spot detection is: when ultrasonic waves propagate in the medium, they have the characteristic of reflection on the interface of different qualities. If a defect is encountered, and the size of the defect is equal to or greater than the wavelength of the ultrasonic wave, the ultrasonic wave will be reflected back on the defect, and the reflected wave can be displayed on the screen. The controller analyzes the data measured by the ultrasonic probe. When the welding spot is good, the reflected wave is a gentle waveform. Whether it is a cold weld is determined by the height of the waveform peak tested and the set waveform upper limit.

[0055] Figure 2 It is a structural schematic diagram of a base portion according to an embodiment of the utility model; Figure 3 Schematic diagram of the structure of the drip tube and the ultrasonic detection unit according to the embodiment of the utility model. Figure 2 and Figure 3As shown, the detection equipment provided by the exemplary embodiment of the utility model includes an ultrasonic detection part, a dripping part, a slide rail 50 and a base part 51 slidably arranged on the slide rail 50; the dripping part includes at least one dripping tube 21, one end of at least one dripping tube 21 is connected to the base part 51, and the other end is used to drip the ultrasonic propagation medium on the welding point 31; the ultrasonic detection part includes at least one ultrasonic probe 11 and at least one first linear motion mechanism 13, the fixed end 131 of at least one first linear motion mechanism 13 is arranged on the base part 51, and each ultrasonic probe 11 is arranged at the first telescopic end 132 of the corresponding first linear motion mechanism 13.

[0056] In actual use, when the photovoltaic junction box 30 on the photovoltaic module reaches the detection area, the base part 51 moves along the slide rail 50 under the drive of the driving device until the drip tube 21 is located above the weld 31 to be detected, and the ultrasonic propagation medium required for ultrasonic detection is dripped onto the surface of the weld 31; then the base part 51 continues to move along the slide rail 50 until the ultrasonic probe 11 is located above the weld 31 to be detected. At this time, the first telescopic end 132 of the first linear motion mechanism 13 is extended, and the ultrasonic probe 11 located at the first telescopic end 132 is attached to the weld 31 coated with the ultrasonic propagation medium, and the controller compares the data measured by the ultrasonic probe with the set reflection waveform, and then determines whether the weld 31 has a defect.

[0057] Exemplarily, the ultrasonic probe 11 can be directly arranged on the first telescopic end 132 of the first linear motion mechanism 13, or can be indirectly connected to the first telescopic end 132 of the first linear motion mechanism 13. For example, the first telescopic end 132 and the ultrasonic probe 11 are connected through an arm 12 so that the slide rail 50 has a certain height to facilitate the passage of the photovoltaic module.

[0058] For example, the photovoltaic module has three photovoltaic junction boxes 30 and they are arranged in a straight line. The two welding points 31 in each photovoltaic junction box 30 are also distributed along the straight line. When one of the photovoltaic junction boxes 30 reaches the detection area, that is, below the slide rail 50, the base 51 slides along the slide rail 50 to complete the detection of all welding points 31 on all three photovoltaic junction boxes 30. Based on this, the structure of the welding point detection equipment is relatively simple, and the slide rail 50 can be used to accurately align the drip tube 21, the ultrasonic probe 11 and each welding point 31, thereby improving the detection reliability.

[0059] In order to accurately control the amount of ultrasonic propagation medium required for ultrasonic detection of the weld 31, the detection device provided by the exemplary embodiment of the utility model further includes a pushing mechanism, which controls the amount of ultrasonic propagation medium dripped by the drip tube 21 each time. Exemplarily, the amount pushed by the pushing mechanism is 1ml to 2ml; the ultrasonic propagation medium can be high-resistance pure water, No. 20 to 40 motor oil or carboxymethyl cellulose chemical paste, etc., and the following is explained by taking high-resistance pure water as an example, and the high-resistance pure water can be deionized water, so as to provide a transmission medium for ultrasonic detection.

[0060] There can be many kinds of pushing mechanisms for controlling the amount of water discharged by the drip tube 21 each time.

[0061] For example, the syringe effect is used to control the water output through air pressure. Figure 4 is a schematic diagram of the structure of the push mechanism according to the embodiment of the utility model, such as Figure 4 As shown, the pushing mechanism includes a cylinder 22, a second linear motion mechanism 24 and a piston 23 adapted to the cylinder 22, the piston 23 is connected to the second telescopic end 242 of the second linear motion mechanism 24, and the end of the cylinder 22 away from the second linear motion mechanism 24 is connected to at least one drip tube 21.

[0062] The cylinder 22 is filled with high-resistance pure water, and the second linear motion mechanism 24 includes a fixed portion 241 and a second telescopic end 242. When the second telescopic end 242 is extended, it drives the piston 23 to move in the cylinder 22, thereby changing the air pressure in the cylinder 22, so that the drip tube 21 connected to the cylinder 22 drips a fixed amount of water each time, which can ensure the amount of transmission medium required for ultrasonic detection, and does not produce excessive water, causing a short circuit in the photovoltaic junction box 30. Exemplarily, the cylinder 22 can be arranged outside the housing of the detection device.

[0063] For another example, the pushing mechanism includes a barrel 22 and a metering pump. The barrel 22 is used to contain an ultrasonic propagation medium. The barrel 22 is connected to the drip tube 21 through the metering pump. Exemplarily, the metering pump can be a peristaltic pump, a diaphragm pump, a plunger pump, a syringe pump or a gear pump, which is arranged on the pipeline between the barrel 22 and the drip tube 21, and the drip tube 21 drips a fixed amount of water each time through quantitative pumping.

[0064] In some embodiments, the first linear motion mechanism 13 may be one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder; the second linear motion mechanism 24 may also be one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0065] like Figure 3 and Figure 5As shown, there are two ultrasonic probes 11, and the two ultrasonic probes 11 are spaced apart along a preset direction, and the preset direction refers to: the extension direction of the slide rail 50. Since the photovoltaic junction box 30 has two welding points 31, the two ultrasonic probes 11 correspond to the two welding points 31 respectively, so that the two welding points 31 can be ultrasonically detected at the same time. Exemplarily, the two ultrasonic probes 11 are connected to the first telescopic end 132 of the same first linear motion mechanism 13 through the arm 12; or, the two ultrasonic probes 11 are connected to the first telescopic ends 132 of the two first linear motion mechanisms 13 through the two arm 12.

[0066] Similarly, there are two drip tubes 21, which are spaced apart along a preset direction. When the drip tube 21 moves to the two welding points 31 of the photovoltaic junction box 30, water can be applied to the two welding points 31 at the same time, thereby improving the operation efficiency.

[0067] After the ultrasonic inspection of the welding points 31 of the photovoltaic junction box 30 is completed, the water remaining on the welding points 31 may affect or damage the function of the photovoltaic junction box 30 . Figure 6 Schematic diagram of the structure of the blowing part according to the embodiment of the utility model. Figure 6 As shown, the detection device provided by the exemplary embodiment of the utility model further includes a blowing part 70 for removing the ultrasonic propagation medium on the welding point 31, and the air outlet of the blowing part 70 faces the welding point 31. Exemplarily, the blowing part 70 can be arranged on the base part 51, and the water on the welding point 31 is dried immediately after the detection is completed.

[0068] Figure 1 is a schematic diagram of the axonometric structure of the detection device according to the embodiment of the utility model; Figure 1 As shown, the detection device further includes a conveying mechanism 60 , which is used to transport the photovoltaic junction box 30 , for example, the photovoltaic junction box 30 can be transported to a target area; the target area refers to an area opposite to the slide rail 50 or the ultrasonic probe 11 .

[0069] Exemplarily, the conveying mechanism 60 may include a plurality of rollers sequentially distributed along the detection device from the entrance to the exit. When the rollers rotate, the photovoltaic component is driven by the roller closest to the entrance and gradually approaches the adjacent roller. When it contacts the roller, it gradually approaches the next adjacent roller. After being sequentially conveyed by each roller, the photovoltaic junction box 30 on the photovoltaic component reaches the target area, and continues to be conveyed to the outside of the detection device after the detection is completed. Exemplarily, the conveying mechanism 60 may also convey the photovoltaic component in a manner of a roller-driven conveyor belt. For example, only one roller is provided at the entrance and exit of the detection device, respectively. The conveyor belt is wound around the two rollers. The rotation of the two rollers drives the conveyor belt to rotate, and the photovoltaic component on the conveyor belt moves from the entrance to the exit of the detection device.

[0070] like Figure 6 As shown, the detection device also includes a casing, and a first opening 41 for the photovoltaic junction box 30 to pass through is provided at a portion of the casing near the tail end of the conveying mechanism 60, and a blowing portion 70 is arranged at the first opening 41. Exemplarily, the blowing port of the blowing portion 70 is a long strip-shaped blowing port. When the three photovoltaic junction boxes 30 on the photovoltaic module pass through the first opening 41 driven by the conveying mechanism 60, the blowing portion 70 can dry the water of each welding point 31 at one time. The blowing portion 70 is arranged downstream after the detection is completed and does not affect the detection of the next photovoltaic module, so the production efficiency is relatively high. It should be noted that the two ends of the slide rail 50 are fixed at positions near the top of the two opposite shell walls of the casing.

[0071] like Figure 1 As shown, the detection equipment also includes two position sensing devices 43 which are connected to the conveying mechanism 60 through a controller for communication. A second opening 42 for the photovoltaic junction box 30 to pass through is provided at a portion of the casing near the head end of the conveying mechanism 60. One of the two position sensing devices 43 is provided at the first opening 41, and the other is provided at the second opening 42.

[0072] In actual use, one position sensing device 43 is located at the first opening 41 where the photovoltaic component enters the detection device, and the other position sensing device 43 is located at the second opening 42 where the photovoltaic component enters the detection device. When the position sensing device 43 located at the first opening 41 senses that the photovoltaic component is transmitted to the detection device, the information is transmitted to the controller of the device, and the controller controls the conveying mechanism 60 to operate and transport the photovoltaic component to the target area, that is, below the slide rail 50. At this time, the position sensing device 43 located at the second opening 42 will sense that the photovoltaic junction box 30 is in place, and transmit information to the controller, and the controller controls the conveying mechanism 60 to stop operating. Then the controller controls the drip tube 21 to move above the solder joint 31 of the photovoltaic junction box 30, and applies water on its surface through the pushing mechanism, and then controls the base part 51 to move, and moves the ultrasonic probe 11 above the solder joint 31. When the first telescopic end 132 of the first linear motion mechanism 13 is extended, the ultrasonic probe 11 is driven to fit on the solder joint 31 to detect whether it is a cold solder joint. Exemplarily, the above-mentioned controller can be a computer device or a PLC.

[0073] The exemplary embodiment of the present utility model further provides a photovoltaic assembly, which includes the photovoltaic junction box of the above embodiment.

[0074] The advantages of the above photovoltaic assembly over the prior art are the same as the advantages of the above detection equipment over the prior art, which will not be repeated here.

[0075] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A photovoltaic junction box, comprising a box body, a diode and two plates connected to the diode, wherein the diode and the two plates are located in the box body, and the plates and the busbars entering the box body are welded to form welding points, characterized in that: The cavity of the box body forms two independent accommodating spaces through a barrier structure, and the two electrode plates are respectively located in the two accommodating spaces. The barrier structure is used to block the ultrasonic propagation medium from flowing between the two accommodating spaces when ultrasonic waves are used to detect the welding points.

2. The photovoltaic junction box according to claim 1, characterized in that: The blocking structure includes a blocking plate arranged in the box body, the blocking plate extends from one side wall of the box body to the other opposite side wall to form the blocking structure, or the blocking plate cooperates with a part of the diode to form the blocking structure.

3. The photovoltaic junction box according to claim 2, characterized in that: There is a first distance between the top surface of the blocking plate and the bottom wall of the cavity, and there is a second distance between the top surface of the electrode plate and the bottom wall of the cavity, and the first distance is greater than the second distance.

4. The photovoltaic junction box according to claim 1, characterized in that: Each of the electrode plates is arranged with a first welding hole and a second welding hole along a direction away from the diode; The bottom wall of the box body is provided with two first through holes opposite to the first welding holes and two second through holes opposite to the second welding holes; The first through hole and the first welding hole are used for the bus bar to enter the box body; or, the second through hole and the second welding hole are used for the bus bar to enter the box body.

5. The photovoltaic junction box according to claim 2 or 3, characterized in that: The blocking plate and the box body are an integrally formed structure.

6. A solder joint detection device, characterized in that: The welding point is a welding point where the plate of the photovoltaic junction box is connected to the bus bar, and the photovoltaic junction box is the photovoltaic junction box according to any one of claims 1 to 5; the detection device includes an ultrasonic detection part, a dripping part, a slide rail, and a base part slidably arranged on the slide rail; The dripping part includes at least one dripping tube, one end of the at least one dripping tube is connected to the base part, and the other end is used to drip the ultrasonic propagation medium on the welding point; The ultrasonic detection part includes at least one ultrasonic probe and at least one first linear motion mechanism. The fixed end of the at least one first linear motion mechanism is arranged on the base part, and each of the ultrasonic probes is arranged on the first telescopic end of the corresponding first linear motion mechanism.

7. The solder joint inspection device according to claim 6, characterized in that: The dripping part further includes a pushing mechanism, which includes a barrel, a second linear motion mechanism and a piston adapted to the barrel, the piston is connected to the second telescopic end of the second linear motion mechanism, and one end of the barrel away from the second linear motion mechanism is connected to the at least one dripping tube; or, The pushing mechanism comprises a barrel and a metering pump, and the barrel and the drip tube are connected through the metering pump; The cylinder is used to contain the ultrasonic propagation medium.

8. The solder joint inspection device according to claim 6, characterized in that: The detection device further comprises a blowing part for removing the ultrasonic propagation medium on the welding point, and the air outlet of the blowing part faces the welding point.

9. The solder joint inspection device according to claim 8, characterized in that: The detection device further comprises a conveying mechanism, and the conveying mechanism is used for conveying the photovoltaic junction box.

10. The solder joint inspection device according to claim 9, characterized in that: The detection device further comprises a casing, wherein a first opening for the photovoltaic junction box to pass through is formed at a portion of the casing close to the rear end of the conveying mechanism, and the blowing portion is arranged at the first opening.

Images